Question

How can I convert a ‘System::String ^’ to ‘const char *’ in vc++?

My code:

String ^Result1= "C:/Users/Dev/Desktop/imag.jpg";

IplImage *img1 = cvLoadImage(Result1, 1);

if I do like above it will generate following error.

error C2664: 'cvLoadImage' : cannot convert parameter 1 from 'System::String ^' to 'const char *'

Please help me.

Answer 1

This is work for me.

void MarshalString ( String ^ s, string& os ) {

   using namespace Runtime::InteropServices;

   const char* chars = 
      (const char*)(Marshal::StringToHGlobalAnsi(s)).ToPointer();

   os = chars;

   Marshal::FreeHGlobal(IntPtr((void*)chars));
}